Device for turning the feed device for a rock drill

ABSTRACT

The present invention concerns a device for turning the feed device of a rock drill with references to the guiding jib around a transversal, fixed, horizontal shaft by the aid of a power cylinder. The invention is characterized in that the feed device has been connected to a turning shaft running parallel to the said fixed shaft and journalled in a turning head turnably carried on the fixed shaft, which shafts have been connected with each other, most appropriately with the aid of gears, and that a power cylinder has been connected between the guiding jib and the turning head.

United States Patent 1191 Toppila 1 1 Apr. 17, 1973 1 DEVICE FOR TURNING THE FEED DEVICE FOR A ROCK DRILL [75] Inventor: Ilrnari Toppila, Tampere, Finland [73] Assignee: 0y Tampella AB, Tampere, Finland [22] Filed: June 28, 1971 21 Appl. No.: 157,429

[30] Foreign Application Priority Data UNITED STATES PATENTS 2,9l7,282- l2/l959 bee ..l73/43 X Primary ExaminerEmest R. Purser Att0rneyEric H. Waters et al.

[ ABSTRACT The present invention concerns a device for turning the feed device of a rock drill with references to the guiding jib around a transversal, fixed, horizontal shaft by the aid of a power cylinder. The invention is characterized in that the feed device has been connected to a turning shaft running parallel to the said fixed shaft and joumalled in a turning head turnably carried on the fixed shaft, which shafts have been con' nect'ed with each other, most appropriately with the aid of gears,-and that a power cylinder has been connected between the guiding jib and the turning head.

2 Claims, 5 Drawing Figures PATENTEB APR 1 71973 SHEET 1 [1F 2 PATENTED APR 1 7 I975 SHEET 2 BF 2 DEVICE FOR TURNING THE FEED DEVICE FOR A ROCK DRILL The present invention concerns the turning elements for the feed device connected with the guiding jib of a rock drill. A jib of this kind is usually attached by pivots at one end to the drilling carriage so that the jib can be swivelled by means of hydraulic actuating devices in horizontal and vertical direction. To the free end of the jib the feed device of the rock drill has been attached so that it can be turned with reference to the jib by the aid of hydraulic actuating devices, about two axes which are at right angles against each other.

The general difficulty encountered in conventional designs is that the feed device cannot be made to turn in the vertical plane through a large enough angle, which is required in order that the same device might be used for drilling upwardly and downwardly directed holes.

In prior art, sufficient turnability has been achieved by providing for the pivot pin on the piston rod of the turning cylinder a fork with a plurality of holes, whereby one has been able, dependent on the direction of drilling, to select the suitable alternative among a plurality of points of attachment. In actual practice the performing of this change is time-consuming and awkthat the shafts have been mutually connected by gear wheels.

The invention is described in the following by the aid of an example, with reference to the attached drawings, wherein FIG. 1 shows the guiding jib in elevational view,

FIG. 2 shows the same, viewed from above,

FIG. 3 presents, on a larger scale, the upper end of the guiding jib, as seen from the side and partly sectioned,

FIG. 4 shows the upper end of the guiding jib, seen from above and partly sectioned, and

FIG. 5 is an axonometrical view of the upper end of the guiding jib.

The guiding jib 1 has been connected to the drilling carriage 2 so that it can be turned in the horizontal and vertical directions with the aid of power cylinders 3 and 4. To the upper end of the jib 1 has been connected the cradle 7 of the feed device 6 of the drill 5 so that the cradle 7, and thus also the feed device 6 itself and the drill 5, are turnable in horizontal and vertical direction by means of the power cylinders 8 and 9. Between the cradle 7 and the feed device 6 the displacement cylinder 10 has been mounted, by means of which the feed device can be displaced in the direction of drilling toward the rock. The feed device has been depicted in FIG. 1 only and it has been omitted for the sake of clarity in the other figures.

The present invention concerns those elements by the aid of which the feed device 6, that is its cradle 7, is

turned with reference to the jib l in the vertical plane.

To the end of the 'ib l the shaft 11 has been rigidly fixed. On this shaf 11 the turning head 12 has een mounted on the turning shaft 13. To the end of the turning shaft 13 there has been attached by the pivot joint 16 the cradle 7 of the feed device 6. To the opposite end of the turning shaft 13 the power cylinder 8 has been connected, by means of which the cradle 7 I and thus also the feed device is turned about the pivot 16 in the horizontal plane. In the vertical plane, the cradle 7 is turned with the aid of the power cylinder 9, which has been connected by one end to the jib 1. and by the other end pivotally to the lug 17, which has been fixed to the turning head I2. The power cylinder 9 is, for its greater part, located within the fork 18 provided on the jib 1. By this means the susceptibility of the cylinder 9 to damage is reduced.

When the turning head 12 is turned with the aid of the power cylinder 9, the cradle 7, and correspondingly together with it the feed device 6, turns about the fixed shaft 11. But since the cradle 7 has been connected with the turning shaft 13, the gear wheel 15 'of which rolls along the fixed gear wheel 14, this causes a considerable additional turning of the cradle 7. In the drawing a case has been illustrated in which the gear wheels 14 and 15 are equal in size, whereby the cradle 7 turns through an angle of 180 when the turning head 12 is turned with the aid of the power cylinder 9. But the gear wheels 14 and 15 may equally well be of different sizes. If the gear wheel 14 is the larger one, the difference of the turning angles will be greater than has been presented above.

Different embodiments of the invention may naturally vary within the scope of the claims set forth below. This applies, for instance, to the manner in which the fixed shaft 11 and the turning shaft 13 have been connected with each other. According to the drawing, the gears are in immediate mesh, but there may equally well be one or several intermediate gears between them. On the other hand the motion may be transmitted, except by gear wheels, also, e.g., by means of chains.

Iclaim 1. In an apparatus including a power cylinder-actuated, transversely extending, fixed, horizontal shaft adapted to turn the feed device of a rock drill with reference to a guiding jib thereof; the improvement comprising a turning head journalled on said fixed shaft; 21 turnable shaft being movably connected to said turning heat at one end thereof; and means connecting the other end of said turnable shaft to said fixed .shaft, said turnable and fixed shafts extending in parallel relationship, said shaft connecting means comprising a pair of intermeshing gears, one of said gears being a fixed gear, and the other of said gears being rotatable in response to actuation of said power cylinder, said power cylinder interconnecting said turning head and said guiding jib.

2. Device according to claim 1, characterized in that the gear wheels are equal in size. 

1. In an apparatus including a power cylinder-actuated, transversely extending, fixed, horizontal shaft adapted to turn the feed device of a rock drill with reference to a guiding jib thereof; the improvement comprising a turning head journalled on said fixed shaft; a turnable shaft being movably connected to said turning heat at one end thereof; and means connecting the other end of said turnable shaft to said fixed shaft, said turnable and fixed shafts extending in parallel relationship, said shaft connecting means comprising a pair of intermeshing gears, one of said gears being a fixed gear, and the other of said gears being rotatable in response to actuation of said power cylinder, said power cylinder interconnecting said turning head and said guiding jib.
 2. Device according to claim 1, characterized in that the gear wheels are equal in size. 